Excuse me what's the meaning of LO or PO?If you update the player you definitely will see an upgrade, if only from just using LO instead of PO. YOu might or might not hear the difference depending on your headphones however I definitely use the A5 for anything about 100 ohms on my X7ii.
and one question I have thay does A5 change any quality of sound or it just only for higher volume to hear? ( my headphone audiotechnica ath-m50x is 38 impedance )
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